你好,我使用锂电池经过稳压供电,想用cc2640r2f 的adc测电量,目前锂电池的电压3.89v ,使用两个1m的电阻分压,但是,分压完完毕后,万用表测量为1.89v,cc2640r2f Io28测到电压1.7v左右;我应该怎么提高精度?
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